@InProceedings{sun-tsujii:2009:EACL,
  author    = {Sun, Xu  and  Tsujii, Jun'ichi},
  title     = {Sequential Labeling with Latent Variables: An Exact Inference Algorithm and its Efficient Approximation},
  booktitle = {Proceedings of the 12th Conference of the European Chapter of the ACL (EACL 2009)},
  month     = {March},
  year      = {2009},
  address   = {Athens, Greece},
  publisher = {Association for Computational Linguistics},
  pages     = {772--780},
  url       = {http://www.aclweb.org/anthology/E09-1088}
}